C++ - What is the difference between operator new and the new operator?

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What is the difference between operator new and the new operator?

Total Answers and Comments: 5

Last Update: October 19, 2009 Asked by: suman

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Submitted by: madhav_kelkar

This is what happens when you create a new object: 1. the memory for the object is allocated using "operator new". 2. the costructor of the class is invoked to properly initialize this memory. As you can see, the new operator does both 1 and 2. The operator new merely allocates memory, it does not initialize it. where as the new operator also initializes it properly by calling the constructor.

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bobsEmc2

November 08, 2005 08:14:09

madhav_kelkar

Member Since: November 2005 Contribution: 1

RE: What is the difference between operator new and th...

This is what happens when you create a new object: 1. the memory for the object is allocated using operator new . 2. the costructor of the class is invoked to properly initialize this memory. As you can see the new operator does both 1 and 2. The operator new merely allocates memory it does not initialize it. where as the new operator also initializes it properly by calling the constructor.

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Overall Rating: +1

January 28, 2006 05:30:05

gaurav_web

Member Since: November 2005 Contribution: 1

RE: What is the difference between operator new and th...

operator new() will do the operator overloading new operator for memory allocation.

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August 08, 2008 06:39:25

vsvraju

Member Since: August 2008 Contribution: 5

RE: What is the difference between operator new and the new operator?

Operator new mean overloading the operator 'new' giving your own defintion for the existing 'new' operator.

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June 12, 2009 08:50:29

gunjan.chandra

Member Since: April 2009 Contribution: 7

RE: What is the difference between operator new and the new operator?

'new' operator allocates new instance of object from the heap thus utilising the most appropiate constructor for the argument.

Operator new is the mechanism of overriding the default heap allocation logic.

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October 16, 2009 02:11:43

satheesh83

Member Since: March 2009 Contribution: 1

RE: What is the difference between operator new and the new operator?

New operator allows to allocate a memory from the heap so a new instance of
a class is created but operator New is used to overload the (new) operator just
like overloading of other operators.

Additionally:

The term "operator new" is used incase when u are overloading the global "new"
operator. We can overload new operator just as any other operators i.e
+ - * etc.

The term "new operator" is used in case of dynamic allocation of memory. When a
variable is allocated memory dynamically the new operator is used.

Eg:

int *p new int;

//here p is pointer to integer. So in order to allocate memory for it we have
used the new operator.

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